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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: KeyRanges.html 939 2015-05-29 01:16:17Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.kv;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.google.common.base.Function;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import com.google.common.base.Preconditions;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import com.google.common.collect.Lists;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import com.google.common.collect.UnmodifiableIterator;<a name="line.13"></a>
<span class="sourceLineNo">014</span><a name="line.14"></a>
<span class="sourceLineNo">015</span>import java.io.IOException;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import java.io.InputStream;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import java.io.OutputStream;<a name="line.17"></a>
<span class="sourceLineNo">018</span>import java.util.ArrayList;<a name="line.18"></a>
<span class="sourceLineNo">019</span>import java.util.Arrays;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.util.Collections;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.util.Iterator;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.util.List;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.NoSuchElementException;<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>import org.jsimpledb.kv.util.KeyListEncoder;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import org.jsimpledb.util.ByteUtil;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.jsimpledb.util.SizeEstimating;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.jsimpledb.util.SizeEstimator;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.jsimpledb.util.UnsignedIntEncoder;<a name="line.29"></a>
<span class="sourceLineNo">030</span><a name="line.30"></a>
<span class="sourceLineNo">031</span>/**<a name="line.31"></a>
<span class="sourceLineNo">032</span> * A fixed set of {@link KeyRange} instances that can be treated as a unified whole, in particular as a {@link KeyFilter}.<a name="line.32"></a>
<span class="sourceLineNo">033</span> *<a name="line.33"></a>
<span class="sourceLineNo">034</span> * &lt;p&gt;<a name="line.34"></a>
<span class="sourceLineNo">035</span> * Instances are immutable.<a name="line.35"></a>
<span class="sourceLineNo">036</span> * &lt;/p&gt;<a name="line.36"></a>
<span class="sourceLineNo">037</span> *<a name="line.37"></a>
<span class="sourceLineNo">038</span> * @see KeyRange<a name="line.38"></a>
<span class="sourceLineNo">039</span> */<a name="line.39"></a>
<span class="sourceLineNo">040</span>public class KeyRanges implements Iterable&lt;KeyRange&gt;, KeyFilter, SizeEstimating {<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span>    /**<a name="line.42"></a>
<span class="sourceLineNo">043</span>     * The empty instance containing zero ranges.<a name="line.43"></a>
<span class="sourceLineNo">044</span>     */<a name="line.44"></a>
<span class="sourceLineNo">045</span>    public static final KeyRanges EMPTY = new KeyRanges(Collections.&lt;KeyRange&gt;emptyList());<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span>    /**<a name="line.47"></a>
<span class="sourceLineNo">048</span>     * The "full" instance containing a single {@link KeyRange} that contains all keys.<a name="line.48"></a>
<span class="sourceLineNo">049</span>     */<a name="line.49"></a>
<span class="sourceLineNo">050</span>    public static final KeyRanges FULL = new KeyRanges(Arrays.asList(KeyRange.FULL));<a name="line.50"></a>
<span class="sourceLineNo">051</span><a name="line.51"></a>
<span class="sourceLineNo">052</span>    private final ArrayList&lt;KeyRange&gt; ranges;<a name="line.52"></a>
<span class="sourceLineNo">053</span><a name="line.53"></a>
<span class="sourceLineNo">054</span>    private volatile KeyRange lastContainingKeyRange;           // used for optimization<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span>// Constructors<a name="line.56"></a>
<span class="sourceLineNo">057</span><a name="line.57"></a>
<span class="sourceLineNo">058</span>    /**<a name="line.58"></a>
<span class="sourceLineNo">059</span>     * Constructor.<a name="line.59"></a>
<span class="sourceLineNo">060</span>     *<a name="line.60"></a>
<span class="sourceLineNo">061</span>     * &lt;p&gt;<a name="line.61"></a>
<span class="sourceLineNo">062</span>     * Creates an instance that contains all keys contained by any of the {@link KeyRange}s in {@code ranges}.<a name="line.62"></a>
<span class="sourceLineNo">063</span>     * The given {@code ranges} may be adjacent, overlap, and/or be listed in any order; this constructor<a name="line.63"></a>
<span class="sourceLineNo">064</span>     * will normalize them.<a name="line.64"></a>
<span class="sourceLineNo">065</span>     * &lt;/p&gt;<a name="line.65"></a>
<span class="sourceLineNo">066</span>     *<a name="line.66"></a>
<span class="sourceLineNo">067</span>     * @param ranges individual key ranges<a name="line.67"></a>
<span class="sourceLineNo">068</span>     * @throws IllegalArgumentException if {@code ranges} or any {@link KeyRange} therein is null<a name="line.68"></a>
<span class="sourceLineNo">069</span>     */<a name="line.69"></a>
<span class="sourceLineNo">070</span>    public KeyRanges(Iterable&lt;? extends KeyRange&gt; ranges) {<a name="line.70"></a>
<span class="sourceLineNo">071</span>        if (ranges == null)<a name="line.71"></a>
<span class="sourceLineNo">072</span>            throw new IllegalArgumentException("null ranges");<a name="line.72"></a>
<span class="sourceLineNo">073</span>        this.ranges = KeyRanges.minimize(Lists.&lt;KeyRange&gt;newArrayList(ranges));<a name="line.73"></a>
<span class="sourceLineNo">074</span>    }<a name="line.74"></a>
<span class="sourceLineNo">075</span><a name="line.75"></a>
<span class="sourceLineNo">076</span>    /**<a name="line.76"></a>
<span class="sourceLineNo">077</span>     * Constructor.<a name="line.77"></a>
<span class="sourceLineNo">078</span>     *<a name="line.78"></a>
<span class="sourceLineNo">079</span>     * &lt;p&gt;<a name="line.79"></a>
<span class="sourceLineNo">080</span>     * Creates an instance that contains all keys contained by any of the {@link KeyRange}s in {@code ranges}.<a name="line.80"></a>
<span class="sourceLineNo">081</span>     * The given {@code ranges} may be adjacent, overlap, and/or be listed in any order; this constructor<a name="line.81"></a>
<span class="sourceLineNo">082</span>     * will normalize them.<a name="line.82"></a>
<span class="sourceLineNo">083</span>     * &lt;/p&gt;<a name="line.83"></a>
<span class="sourceLineNo">084</span>     *<a name="line.84"></a>
<span class="sourceLineNo">085</span>     * @param ranges individual key ranges<a name="line.85"></a>
<span class="sourceLineNo">086</span>     * @throws IllegalArgumentException if {@code ranges} or any {@link KeyRange} therein is null<a name="line.86"></a>
<span class="sourceLineNo">087</span>     */<a name="line.87"></a>
<span class="sourceLineNo">088</span>    public KeyRanges(KeyRange... ranges) {<a name="line.88"></a>
<span class="sourceLineNo">089</span>        this(ranges != null ? Arrays.asList(ranges) : null);<a name="line.89"></a>
<span class="sourceLineNo">090</span>    }<a name="line.90"></a>
<span class="sourceLineNo">091</span><a name="line.91"></a>
<span class="sourceLineNo">092</span>    /**<a name="line.92"></a>
<span class="sourceLineNo">093</span>     * Constructor for an instance containing a single range.<a name="line.93"></a>
<span class="sourceLineNo">094</span>     *<a name="line.94"></a>
<span class="sourceLineNo">095</span>     * @param range single range<a name="line.95"></a>
<span class="sourceLineNo">096</span>     * @throws IllegalArgumentException if {@code range} is null<a name="line.96"></a>
<span class="sourceLineNo">097</span>     */<a name="line.97"></a>
<span class="sourceLineNo">098</span>    public KeyRanges(KeyRange range) {<a name="line.98"></a>
<span class="sourceLineNo">099</span>        this(Collections.singletonList(range));<a name="line.99"></a>
<span class="sourceLineNo">100</span>    }<a name="line.100"></a>
<span class="sourceLineNo">101</span><a name="line.101"></a>
<span class="sourceLineNo">102</span>    /**<a name="line.102"></a>
<span class="sourceLineNo">103</span>     * Constructor for an instance containing a single range containing a single key.<a name="line.103"></a>
<span class="sourceLineNo">104</span>     *<a name="line.104"></a>
<span class="sourceLineNo">105</span>     * @param key key in range; must not be null<a name="line.105"></a>
<span class="sourceLineNo">106</span>     * @throws IllegalArgumentException if {@code key} is null<a name="line.106"></a>
<span class="sourceLineNo">107</span>     */<a name="line.107"></a>
<span class="sourceLineNo">108</span>    public KeyRanges(byte[] key) {<a name="line.108"></a>
<span class="sourceLineNo">109</span>        this(Collections.singletonList(new KeyRange(key)));<a name="line.109"></a>
<span class="sourceLineNo">110</span>    }<a name="line.110"></a>
<span class="sourceLineNo">111</span><a name="line.111"></a>
<span class="sourceLineNo">112</span>    /**<a name="line.112"></a>
<span class="sourceLineNo">113</span>     * Constructor for an instance containing a single range.<a name="line.113"></a>
<span class="sourceLineNo">114</span>     *<a name="line.114"></a>
<span class="sourceLineNo">115</span>     * @param min minimum key (inclusive); must not be null<a name="line.115"></a>
<span class="sourceLineNo">116</span>     * @param max maximum key (exclusive), or null for no maximum<a name="line.116"></a>
<span class="sourceLineNo">117</span>     * @throws IllegalArgumentException if {@code min &gt; max}<a name="line.117"></a>
<span class="sourceLineNo">118</span>     */<a name="line.118"></a>
<span class="sourceLineNo">119</span>    public KeyRanges(byte[] min, byte[] max) {<a name="line.119"></a>
<span class="sourceLineNo">120</span>        this(Collections.singletonList(new KeyRange(min, max)));<a name="line.120"></a>
<span class="sourceLineNo">121</span>    }<a name="line.121"></a>
<span class="sourceLineNo">122</span><a name="line.122"></a>
<span class="sourceLineNo">123</span>    /**<a name="line.123"></a>
<span class="sourceLineNo">124</span>     * Construct an instance containing a single range corresponding to all keys with the given prefix.<a name="line.124"></a>
<span class="sourceLineNo">125</span>     *<a name="line.125"></a>
<span class="sourceLineNo">126</span>     * @param prefix prefix of all keys in the range<a name="line.126"></a>
<span class="sourceLineNo">127</span>     * @return instance containing all keys prefixed by {@code prefix}<a name="line.127"></a>
<span class="sourceLineNo">128</span>     * @throws IllegalArgumentException if {@code prefix} is null<a name="line.128"></a>
<span class="sourceLineNo">129</span>     */<a name="line.129"></a>
<span class="sourceLineNo">130</span>    public static KeyRanges forPrefix(byte[] prefix) {<a name="line.130"></a>
<span class="sourceLineNo">131</span>        return new KeyRanges(KeyRange.forPrefix(prefix));<a name="line.131"></a>
<span class="sourceLineNo">132</span>    }<a name="line.132"></a>
<span class="sourceLineNo">133</span><a name="line.133"></a>
<span class="sourceLineNo">134</span>// Instance methods<a name="line.134"></a>
<span class="sourceLineNo">135</span><a name="line.135"></a>
<span class="sourceLineNo">136</span>    /**<a name="line.136"></a>
<span class="sourceLineNo">137</span>     * Get the {@link KeyRange}s underlying with this instance as a list.<a name="line.137"></a>
<span class="sourceLineNo">138</span>     *<a name="line.138"></a>
<span class="sourceLineNo">139</span>     * &lt;p&gt;<a name="line.139"></a>
<span class="sourceLineNo">140</span>     * The returned {@link KeyRange}s will be listed in order.<a name="line.140"></a>
<span class="sourceLineNo">141</span>     * &lt;/p&gt;<a name="line.141"></a>
<span class="sourceLineNo">142</span>     *<a name="line.142"></a>
<span class="sourceLineNo">143</span>     * @return minimal, unmodifiable list of {@link KeyRange}s sorted by key range<a name="line.143"></a>
<span class="sourceLineNo">144</span>     */<a name="line.144"></a>
<span class="sourceLineNo">145</span>    public List&lt;KeyRange&gt; asList() {<a name="line.145"></a>
<span class="sourceLineNo">146</span>        return Collections.unmodifiableList(this.ranges);<a name="line.146"></a>
<span class="sourceLineNo">147</span>    }<a name="line.147"></a>
<span class="sourceLineNo">148</span><a name="line.148"></a>
<span class="sourceLineNo">149</span>    /**<a name="line.149"></a>
<span class="sourceLineNo">150</span>     * Determine whether this instance is empty, i.e., contains no keys.<a name="line.150"></a>
<span class="sourceLineNo">151</span>     *<a name="line.151"></a>
<span class="sourceLineNo">152</span>     * @return true if this instance is empty<a name="line.152"></a>
<span class="sourceLineNo">153</span>     */<a name="line.153"></a>
<span class="sourceLineNo">154</span>    public boolean isEmpty() {<a name="line.154"></a>
<span class="sourceLineNo">155</span>        return this.ranges.isEmpty();<a name="line.155"></a>
<span class="sourceLineNo">156</span>    }<a name="line.156"></a>
<span class="sourceLineNo">157</span><a name="line.157"></a>
<span class="sourceLineNo">158</span>    /**<a name="line.158"></a>
<span class="sourceLineNo">159</span>     * Determine whether this instance is "full", i.e., contains all keys.<a name="line.159"></a>
<span class="sourceLineNo">160</span>     *<a name="line.160"></a>
<span class="sourceLineNo">161</span>     * @return true if this instance is full<a name="line.161"></a>
<span class="sourceLineNo">162</span>     */<a name="line.162"></a>
<span class="sourceLineNo">163</span>    public boolean isFull() {<a name="line.163"></a>
<span class="sourceLineNo">164</span>        return this.ranges.size() == 1 &amp;&amp; this.ranges.get(0).isFull();<a name="line.164"></a>
<span class="sourceLineNo">165</span>    }<a name="line.165"></a>
<span class="sourceLineNo">166</span><a name="line.166"></a>
<span class="sourceLineNo">167</span>    /**<a name="line.167"></a>
<span class="sourceLineNo">168</span>     * Get the minimum key contained by this instance (inclusive).<a name="line.168"></a>
<span class="sourceLineNo">169</span>     *<a name="line.169"></a>
<span class="sourceLineNo">170</span>     * @return minimum key contained by this instance (inclusive), or null if this instance {@link #isEmpty}<a name="line.170"></a>
<span class="sourceLineNo">171</span>     */<a name="line.171"></a>
<span class="sourceLineNo">172</span>    public byte[] getMin() {<a name="line.172"></a>
<span class="sourceLineNo">173</span>        return !this.ranges.isEmpty() ? this.ranges.get(0).getMin() : null;<a name="line.173"></a>
<span class="sourceLineNo">174</span>    }<a name="line.174"></a>
<span class="sourceLineNo">175</span><a name="line.175"></a>
<span class="sourceLineNo">176</span>    /**<a name="line.176"></a>
<span class="sourceLineNo">177</span>     * Get the maximum key contained by this instance (exclusive).<a name="line.177"></a>
<span class="sourceLineNo">178</span>     *<a name="line.178"></a>
<span class="sourceLineNo">179</span>     * @return maximum key contained by this instance (exclusive),<a name="line.179"></a>
<span class="sourceLineNo">180</span>     *  or null if there is no upper bound, or this instance {@link #isEmpty}<a name="line.180"></a>
<span class="sourceLineNo">181</span>     */<a name="line.181"></a>
<span class="sourceLineNo">182</span>    public byte[] getMax() {<a name="line.182"></a>
<span class="sourceLineNo">183</span>        final int numRanges = this.ranges.size();<a name="line.183"></a>
<span class="sourceLineNo">184</span>        return numRanges &gt; 0 ? this.ranges.get(numRanges - 1).getMax() : null;<a name="line.184"></a>
<span class="sourceLineNo">185</span>    }<a name="line.185"></a>
<span class="sourceLineNo">186</span><a name="line.186"></a>
<span class="sourceLineNo">187</span>    /**<a name="line.187"></a>
<span class="sourceLineNo">188</span>     * Create a new instance from this one, with each {@link KeyRange} prefixed by the given byte sequence.<a name="line.188"></a>
<span class="sourceLineNo">189</span>     *<a name="line.189"></a>
<span class="sourceLineNo">190</span>     * @param prefix prefix to apply to this instance<a name="line.190"></a>
<span class="sourceLineNo">191</span>     * @return prefixed instance<a name="line.191"></a>
<span class="sourceLineNo">192</span>     * @throws IllegalArgumentException if {@code prefix} is null<a name="line.192"></a>
<span class="sourceLineNo">193</span>     */<a name="line.193"></a>
<span class="sourceLineNo">194</span>    public KeyRanges prefixedBy(final byte[] prefix) {<a name="line.194"></a>
<span class="sourceLineNo">195</span>        return new KeyRanges(Lists.transform(this.ranges, new Function&lt;KeyRange, KeyRange&gt;() {<a name="line.195"></a>
<span class="sourceLineNo">196</span>            @Override<a name="line.196"></a>
<span class="sourceLineNo">197</span>            public KeyRange apply(KeyRange keyRange) {<a name="line.197"></a>
<span class="sourceLineNo">198</span>                return keyRange.prefixedBy(prefix);<a name="line.198"></a>
<span class="sourceLineNo">199</span>            }<a name="line.199"></a>
<span class="sourceLineNo">200</span>        }));<a name="line.200"></a>
<span class="sourceLineNo">201</span>    }<a name="line.201"></a>
<span class="sourceLineNo">202</span><a name="line.202"></a>
<span class="sourceLineNo">203</span>    /**<a name="line.203"></a>
<span class="sourceLineNo">204</span>     * Create the inverse of this instance. The inverse contains all keys not contained by this instance.<a name="line.204"></a>
<span class="sourceLineNo">205</span>     *<a name="line.205"></a>
<span class="sourceLineNo">206</span>     * @return the inverse of this instance<a name="line.206"></a>
<span class="sourceLineNo">207</span>     */<a name="line.207"></a>
<span class="sourceLineNo">208</span>    public KeyRanges inverse() {<a name="line.208"></a>
<span class="sourceLineNo">209</span>        final ArrayList&lt;KeyRange&gt; list = new ArrayList&lt;&gt;(this.ranges.size() + 1);<a name="line.209"></a>
<span class="sourceLineNo">210</span>        if (this.ranges.isEmpty())<a name="line.210"></a>
<span class="sourceLineNo">211</span>            return KeyRanges.FULL;<a name="line.211"></a>
<span class="sourceLineNo">212</span>        final KeyRange first = this.ranges.get(0);<a name="line.212"></a>
<span class="sourceLineNo">213</span>        int i = 0;<a name="line.213"></a>
<span class="sourceLineNo">214</span>        byte[] lastMax;<a name="line.214"></a>
<span class="sourceLineNo">215</span>        if (first.getMin().length == 0) {<a name="line.215"></a>
<span class="sourceLineNo">216</span>            if ((lastMax = first.getMax()) == null) {<a name="line.216"></a>
<span class="sourceLineNo">217</span>                assert this.ranges.size() == 1;<a name="line.217"></a>
<span class="sourceLineNo">218</span>                return KeyRanges.EMPTY;<a name="line.218"></a>
<span class="sourceLineNo">219</span>            }<a name="line.219"></a>
<span class="sourceLineNo">220</span>            i++;<a name="line.220"></a>
<span class="sourceLineNo">221</span>        } else<a name="line.221"></a>
<span class="sourceLineNo">222</span>            lastMax = ByteUtil.EMPTY;<a name="line.222"></a>
<span class="sourceLineNo">223</span>        while (true) {<a name="line.223"></a>
<span class="sourceLineNo">224</span>            if (i == this.ranges.size()) {<a name="line.224"></a>
<span class="sourceLineNo">225</span>                list.add(new KeyRange(lastMax, null));<a name="line.225"></a>
<span class="sourceLineNo">226</span>                break;<a name="line.226"></a>
<span class="sourceLineNo">227</span>            }<a name="line.227"></a>
<span class="sourceLineNo">228</span>            final KeyRange next = this.ranges.get(i++);<a name="line.228"></a>
<span class="sourceLineNo">229</span>            list.add(new KeyRange(lastMax, next.getMin()));<a name="line.229"></a>
<span class="sourceLineNo">230</span>            if ((lastMax = next.getMax()) == null) {<a name="line.230"></a>
<span class="sourceLineNo">231</span>                assert i == this.ranges.size();<a name="line.231"></a>
<span class="sourceLineNo">232</span>                break;<a name="line.232"></a>
<span class="sourceLineNo">233</span>            }<a name="line.233"></a>
<span class="sourceLineNo">234</span>        }<a name="line.234"></a>
<span class="sourceLineNo">235</span>        return new KeyRanges(list);<a name="line.235"></a>
<span class="sourceLineNo">236</span>    }<a name="line.236"></a>
<span class="sourceLineNo">237</span><a name="line.237"></a>
<span class="sourceLineNo">238</span>    /**<a name="line.238"></a>
<span class="sourceLineNo">239</span>     * Determine whether this instance contains the given {@link KeyRanges}, i.e., all keys contained by<a name="line.239"></a>
<span class="sourceLineNo">240</span>     * the given {@link KeyRanges} are also contained by this instance.<a name="line.240"></a>
<span class="sourceLineNo">241</span>     *<a name="line.241"></a>
<span class="sourceLineNo">242</span>     * @param ranges other instance to test<a name="line.242"></a>
<span class="sourceLineNo">243</span>     * @return true if this instance contains {@code ranges}, otherwise false<a name="line.243"></a>
<span class="sourceLineNo">244</span>     * @throws IllegalArgumentException if {@code ranges} is null<a name="line.244"></a>
<span class="sourceLineNo">245</span>     */<a name="line.245"></a>
<span class="sourceLineNo">246</span>    public boolean contains(KeyRanges ranges) {<a name="line.246"></a>
<span class="sourceLineNo">247</span>        if (ranges == null)<a name="line.247"></a>
<span class="sourceLineNo">248</span>            throw new IllegalArgumentException("null ranges");<a name="line.248"></a>
<span class="sourceLineNo">249</span>        return ranges.equals(this.intersection(ranges));<a name="line.249"></a>
<span class="sourceLineNo">250</span>    }<a name="line.250"></a>
<span class="sourceLineNo">251</span><a name="line.251"></a>
<span class="sourceLineNo">252</span>    /**<a name="line.252"></a>
<span class="sourceLineNo">253</span>     * Determine whether this instance contains the given {@link KeyRange}, i.e., all keys contained by<a name="line.253"></a>
<span class="sourceLineNo">254</span>     * the given {@link KeyRange} are also contained by this instance.<a name="line.254"></a>
<span class="sourceLineNo">255</span>     *<a name="line.255"></a>
<span class="sourceLineNo">256</span>     * @param range key range to test<a name="line.256"></a>
<span class="sourceLineNo">257</span>     * @return true if this instance contains {@code range}, otherwise false<a name="line.257"></a>
<span class="sourceLineNo">258</span>     * @throws IllegalArgumentException if {@code range} is null<a name="line.258"></a>
<span class="sourceLineNo">259</span>     */<a name="line.259"></a>
<span class="sourceLineNo">260</span>    public boolean contains(KeyRange range) {<a name="line.260"></a>
<span class="sourceLineNo">261</span>        if (range == null)<a name="line.261"></a>
<span class="sourceLineNo">262</span>            throw new IllegalArgumentException("null range");<a name="line.262"></a>
<span class="sourceLineNo">263</span>        final KeyRange[] pair = this.findKey(range.getMin());<a name="line.263"></a>
<span class="sourceLineNo">264</span>        if (pair[0] != pair[1])<a name="line.264"></a>
<span class="sourceLineNo">265</span>            return false;<a name="line.265"></a>
<span class="sourceLineNo">266</span>        final KeyRange container = pair[0];<a name="line.266"></a>
<span class="sourceLineNo">267</span>        if (container == null)<a name="line.267"></a>
<span class="sourceLineNo">268</span>            return false;<a name="line.268"></a>
<span class="sourceLineNo">269</span>        return container.contains(range);<a name="line.269"></a>
<span class="sourceLineNo">270</span>    }<a name="line.270"></a>
<span class="sourceLineNo">271</span><a name="line.271"></a>
<span class="sourceLineNo">272</span>    /**<a name="line.272"></a>
<span class="sourceLineNo">273</span>     * Find the contiguous {@link KeyRange}(s) within this instance containing, or adjacent to, the given key.<a name="line.273"></a>
<span class="sourceLineNo">274</span>     *<a name="line.274"></a>
<span class="sourceLineNo">275</span>     * &lt;p&gt;<a name="line.275"></a>
<span class="sourceLineNo">276</span>     * This method returns an array of length two: if this instance contains {@code key} then both elements are the<a name="line.276"></a>
<span class="sourceLineNo">277</span>     * same Java object, namely, the {@link KeyRange} that contains {@code key}; otherwise, the first element is<a name="line.277"></a>
<span class="sourceLineNo">278</span>     * the nearest {@link KeyRange} to the left of {@code key}, or null if none exists, and the second element is<a name="line.278"></a>
<span class="sourceLineNo">279</span>     * the {@link KeyRange} to the right of {@code key}, or null if none exists. Note if this instance is empty<a name="line.279"></a>
<span class="sourceLineNo">280</span>     * then &lt;code&gt;{ null, null }&lt;/code&gt; is returned.<a name="line.280"></a>
<span class="sourceLineNo">281</span>     * &lt;/p&gt;<a name="line.281"></a>
<span class="sourceLineNo">282</span>     *<a name="line.282"></a>
<span class="sourceLineNo">283</span>     * @param key key to find<a name="line.283"></a>
<span class="sourceLineNo">284</span>     * @return array with the containing {@link KeyRange} or nearest neighbor to the left (or null) and<a name="line.284"></a>
<span class="sourceLineNo">285</span>     *  the containing {@link KeyRange} or nearest neighbor to the right (or null)<a name="line.285"></a>
<span class="sourceLineNo">286</span>     * @throws IllegalArgumentException if {@code key} is null<a name="line.286"></a>
<span class="sourceLineNo">287</span>     */<a name="line.287"></a>
<span class="sourceLineNo">288</span>    public KeyRange[] findKey(byte[] key) {<a name="line.288"></a>
<span class="sourceLineNo">289</span><a name="line.289"></a>
<span class="sourceLineNo">290</span>        // Sanity check<a name="line.290"></a>
<span class="sourceLineNo">291</span>        if (key == null)<a name="line.291"></a>
<span class="sourceLineNo">292</span>            throw new IllegalArgumentException("null key");<a name="line.292"></a>
<span class="sourceLineNo">293</span><a name="line.293"></a>
<span class="sourceLineNo">294</span>        // Optimization: assume previous success is likely to repeat<a name="line.294"></a>
<span class="sourceLineNo">295</span>        final KeyRange temp = this.lastContainingKeyRange;<a name="line.295"></a>
<span class="sourceLineNo">296</span>        if (temp != null) {<a name="line.296"></a>
<span class="sourceLineNo">297</span>            if (temp.contains(key))<a name="line.297"></a>
<span class="sourceLineNo">298</span>                return new KeyRange[] { temp, temp };<a name="line.298"></a>
<span class="sourceLineNo">299</span>            this.lastContainingKeyRange = null;<a name="line.299"></a>
<span class="sourceLineNo">300</span>        }<a name="line.300"></a>
<span class="sourceLineNo">301</span><a name="line.301"></a>
<span class="sourceLineNo">302</span>        // Search for matching range<a name="line.302"></a>
<span class="sourceLineNo">303</span>        final int i = ~Collections.binarySearch(this.ranges, new KeyRange(key, key), KeyRange.SORT_BY_MIN);<a name="line.303"></a>
<span class="sourceLineNo">304</span>        assert i &gt;= 0;                                                  // this.ranges should never contain new KeyRange(key, key)<a name="line.304"></a>
<span class="sourceLineNo">305</span>        KeyRange left = null;<a name="line.305"></a>
<span class="sourceLineNo">306</span>        if (i &gt; 0) {<a name="line.306"></a>
<span class="sourceLineNo">307</span>            if ((left = this.ranges.get(i - 1)).contains(key)) {<a name="line.307"></a>
<span class="sourceLineNo">308</span>                this.lastContainingKeyRange = left;<a name="line.308"></a>
<span class="sourceLineNo">309</span>                return new KeyRange[] { left, left };<a name="line.309"></a>
<span class="sourceLineNo">310</span>            }<a name="line.310"></a>
<span class="sourceLineNo">311</span>        }<a name="line.311"></a>
<span class="sourceLineNo">312</span>        KeyRange right = null;<a name="line.312"></a>
<span class="sourceLineNo">313</span>        if (i &lt; this.ranges.size()) {<a name="line.313"></a>
<span class="sourceLineNo">314</span>            if ((right = this.ranges.get(i)).contains(key)) {<a name="line.314"></a>
<span class="sourceLineNo">315</span>                this.lastContainingKeyRange = right;<a name="line.315"></a>
<span class="sourceLineNo">316</span>                return new KeyRange[] { right, right };<a name="line.316"></a>
<span class="sourceLineNo">317</span>            }<a name="line.317"></a>
<span class="sourceLineNo">318</span>        }<a name="line.318"></a>
<span class="sourceLineNo">319</span><a name="line.319"></a>
<span class="sourceLineNo">320</span>        // Not contained<a name="line.320"></a>
<span class="sourceLineNo">321</span>        return new KeyRange[] { left, right };<a name="line.321"></a>
<span class="sourceLineNo">322</span>    }<a name="line.322"></a>
<span class="sourceLineNo">323</span><a name="line.323"></a>
<span class="sourceLineNo">324</span>    /**<a name="line.324"></a>
<span class="sourceLineNo">325</span>     * Return a new {@link KeyRanges} instance equal to this instance with all keys in the given {@link KeyRange} added.<a name="line.325"></a>
<span class="sourceLineNo">326</span>     *<a name="line.326"></a>
<span class="sourceLineNo">327</span>     * @param range range to add<a name="line.327"></a>
<span class="sourceLineNo">328</span>     * @return this instance with {@code range} added<a name="line.328"></a>
<span class="sourceLineNo">329</span>     * @throws IllegalArgumentException if {@code range} is null<a name="line.329"></a>
<span class="sourceLineNo">330</span>     */<a name="line.330"></a>
<span class="sourceLineNo">331</span>    public KeyRanges add(KeyRange range) {<a name="line.331"></a>
<span class="sourceLineNo">332</span>        if (range == null)<a name="line.332"></a>
<span class="sourceLineNo">333</span>            throw new IllegalArgumentException("null range");<a name="line.333"></a>
<span class="sourceLineNo">334</span>        if (range.isEmpty())<a name="line.334"></a>
<span class="sourceLineNo">335</span>            return this;<a name="line.335"></a>
<span class="sourceLineNo">336</span>        final ArrayList&lt;KeyRange&gt; list = new ArrayList&lt;&gt;(this.ranges.size() + 1);<a name="line.336"></a>
<span class="sourceLineNo">337</span>        list.addAll(this.ranges);<a name="line.337"></a>
<span class="sourceLineNo">338</span>        list.add(range);<a name="line.338"></a>
<span class="sourceLineNo">339</span>        return new KeyRanges(list);<a name="line.339"></a>
<span class="sourceLineNo">340</span>    }<a name="line.340"></a>
<span class="sourceLineNo">341</span><a name="line.341"></a>
<span class="sourceLineNo">342</span>    /**<a name="line.342"></a>
<span class="sourceLineNo">343</span>     * Return a new {@link KeyRanges} instance equal to this instance with all keys in the given {@link KeyRange} removed.<a name="line.343"></a>
<span class="sourceLineNo">344</span>     *<a name="line.344"></a>
<span class="sourceLineNo">345</span>     * @param range range to remove<a name="line.345"></a>
<span class="sourceLineNo">346</span>     * @return this instance with {@code range} removed<a name="line.346"></a>
<span class="sourceLineNo">347</span>     * @throws IllegalArgumentException if {@code range} is null<a name="line.347"></a>
<span class="sourceLineNo">348</span>     */<a name="line.348"></a>
<span class="sourceLineNo">349</span>    public KeyRanges remove(KeyRange range) {<a name="line.349"></a>
<span class="sourceLineNo">350</span>        if (range == null)<a name="line.350"></a>
<span class="sourceLineNo">351</span>            throw new IllegalArgumentException("null range");<a name="line.351"></a>
<span class="sourceLineNo">352</span>        if (range.isEmpty())<a name="line.352"></a>
<span class="sourceLineNo">353</span>            return this;<a name="line.353"></a>
<span class="sourceLineNo">354</span>        return this.intersection(new KeyRanges(range).inverse());<a name="line.354"></a>
<span class="sourceLineNo">355</span>    }<a name="line.355"></a>
<span class="sourceLineNo">356</span><a name="line.356"></a>
<span class="sourceLineNo">357</span>    /**<a name="line.357"></a>
<span class="sourceLineNo">358</span>     * Create an instance that represents the union of this and the provided instance(s).<a name="line.358"></a>
<span class="sourceLineNo">359</span>     *<a name="line.359"></a>
<span class="sourceLineNo">360</span>     * @param others other instances<a name="line.360"></a>
<span class="sourceLineNo">361</span>     * @return the union of this instance and {@code others}<a name="line.361"></a>
<span class="sourceLineNo">362</span>     * @throws IllegalArgumentException if {@code others} or any element in {@code others} is null<a name="line.362"></a>
<span class="sourceLineNo">363</span>     */<a name="line.363"></a>
<span class="sourceLineNo">364</span>    public KeyRanges union(KeyRanges... others) {<a name="line.364"></a>
<span class="sourceLineNo">365</span>        if (others == null)<a name="line.365"></a>
<span class="sourceLineNo">366</span>            throw new IllegalArgumentException("null others");<a name="line.366"></a>
<span class="sourceLineNo">367</span>        if (others.length == 0)<a name="line.367"></a>
<span class="sourceLineNo">368</span>            return this;<a name="line.368"></a>
<span class="sourceLineNo">369</span>        final ArrayList&lt;KeyRange&gt; list = new ArrayList&lt;&gt;(this.ranges.size() + others.length);<a name="line.369"></a>
<span class="sourceLineNo">370</span>        list.addAll(this.ranges);<a name="line.370"></a>
<span class="sourceLineNo">371</span>        for (KeyRanges other : others) {<a name="line.371"></a>
<span class="sourceLineNo">372</span>            if (other == null)<a name="line.372"></a>
<span class="sourceLineNo">373</span>                throw new IllegalArgumentException("null other");<a name="line.373"></a>
<span class="sourceLineNo">374</span>            list.addAll(other.ranges);<a name="line.374"></a>
<span class="sourceLineNo">375</span>        }<a name="line.375"></a>
<span class="sourceLineNo">376</span>        return new KeyRanges(list);<a name="line.376"></a>
<span class="sourceLineNo">377</span>    }<a name="line.377"></a>
<span class="sourceLineNo">378</span><a name="line.378"></a>
<span class="sourceLineNo">379</span>    /**<a name="line.379"></a>
<span class="sourceLineNo">380</span>     * Create an instance that represents the intersection of this and the provided instance(s).<a name="line.380"></a>
<span class="sourceLineNo">381</span>     *<a name="line.381"></a>
<span class="sourceLineNo">382</span>     * @param others other instances<a name="line.382"></a>
<span class="sourceLineNo">383</span>     * @return the intersection of this instance and {@code others}<a name="line.383"></a>
<span class="sourceLineNo">384</span>     * @throws IllegalArgumentException if {@code others} or any element in {@code others} is null<a name="line.384"></a>
<span class="sourceLineNo">385</span>     */<a name="line.385"></a>
<span class="sourceLineNo">386</span>    public KeyRanges intersection(KeyRanges... others) {<a name="line.386"></a>
<span class="sourceLineNo">387</span>        if (others == null)<a name="line.387"></a>
<span class="sourceLineNo">388</span>            throw new IllegalArgumentException("null others");<a name="line.388"></a>
<span class="sourceLineNo">389</span>        if (others.length == 0)<a name="line.389"></a>
<span class="sourceLineNo">390</span>            return this;<a name="line.390"></a>
<span class="sourceLineNo">391</span>        final ArrayList&lt;KeyRange&gt; list = new ArrayList&lt;&gt;(this.ranges.size() + others.length);<a name="line.391"></a>
<span class="sourceLineNo">392</span>        list.addAll(this.inverse().ranges);<a name="line.392"></a>
<span class="sourceLineNo">393</span>        for (KeyRanges other : others) {<a name="line.393"></a>
<span class="sourceLineNo">394</span>            if (other == null)<a name="line.394"></a>
<span class="sourceLineNo">395</span>                throw new IllegalArgumentException("null other");<a name="line.395"></a>
<span class="sourceLineNo">396</span>            list.addAll(other.inverse().ranges);<a name="line.396"></a>
<span class="sourceLineNo">397</span>        }<a name="line.397"></a>
<span class="sourceLineNo">398</span>        return new KeyRanges(list).inverse();<a name="line.398"></a>
<span class="sourceLineNo">399</span>    }<a name="line.399"></a>
<span class="sourceLineNo">400</span><a name="line.400"></a>
<span class="sourceLineNo">401</span>// Iterable&lt;KeyRange&gt;<a name="line.401"></a>
<span class="sourceLineNo">402</span><a name="line.402"></a>
<span class="sourceLineNo">403</span>    @Override<a name="line.403"></a>
<span class="sourceLineNo">404</span>    public Iterator&lt;KeyRange&gt; iterator() {<a name="line.404"></a>
<span class="sourceLineNo">405</span>        return this.asList().iterator();<a name="line.405"></a>
<span class="sourceLineNo">406</span>    }<a name="line.406"></a>
<span class="sourceLineNo">407</span><a name="line.407"></a>
<span class="sourceLineNo">408</span>// SizeEstimating<a name="line.408"></a>
<span class="sourceLineNo">409</span><a name="line.409"></a>
<span class="sourceLineNo">410</span>    @Override<a name="line.410"></a>
<span class="sourceLineNo">411</span>    public void addTo(SizeEstimator estimator) {<a name="line.411"></a>
<span class="sourceLineNo">412</span>        estimator<a name="line.412"></a>
<span class="sourceLineNo">413</span>          .addObjectOverhead()                              // this object overhead<a name="line.413"></a>
<span class="sourceLineNo">414</span>          .addArrayListField(this.ranges)                   // this.ranges<a name="line.414"></a>
<span class="sourceLineNo">415</span>          .addReferenceField();                             // this.lastContainingKeyRange (reference only)<a name="line.415"></a>
<span class="sourceLineNo">416</span>        for (KeyRange range : this.ranges)<a name="line.416"></a>
<span class="sourceLineNo">417</span>            estimator.add(range);<a name="line.417"></a>
<span class="sourceLineNo">418</span>    }<a name="line.418"></a>
<span class="sourceLineNo">419</span><a name="line.419"></a>
<span class="sourceLineNo">420</span>// Serialization<a name="line.420"></a>
<span class="sourceLineNo">421</span><a name="line.421"></a>
<span class="sourceLineNo">422</span>    /**<a name="line.422"></a>
<span class="sourceLineNo">423</span>     * Serialize this instance.<a name="line.423"></a>
<span class="sourceLineNo">424</span>     *<a name="line.424"></a>
<span class="sourceLineNo">425</span>     * @param out output<a name="line.425"></a>
<span class="sourceLineNo">426</span>     * @throws IOException if an error occurs<a name="line.426"></a>
<span class="sourceLineNo">427</span>     * @throws IllegalArgumentException if {@code out} is null<a name="line.427"></a>
<span class="sourceLineNo">428</span>     */<a name="line.428"></a>
<span class="sourceLineNo">429</span>    public void serialize(OutputStream out) throws IOException {<a name="line.429"></a>
<span class="sourceLineNo">430</span>        UnsignedIntEncoder.write(out, this.ranges.size());<a name="line.430"></a>
<span class="sourceLineNo">431</span>        byte[] prev = null;<a name="line.431"></a>
<span class="sourceLineNo">432</span>        for (KeyRange range : this.ranges) {<a name="line.432"></a>
<span class="sourceLineNo">433</span>            final byte[] min = range.getMin();<a name="line.433"></a>
<span class="sourceLineNo">434</span>            final byte[] max = range.getMax();<a name="line.434"></a>
<span class="sourceLineNo">435</span>            assert max != null || range == this.ranges.get(this.ranges.size() - 1);<a name="line.435"></a>
<span class="sourceLineNo">436</span>            KeyListEncoder.write(out, min, prev);<a name="line.436"></a>
<span class="sourceLineNo">437</span>            KeyListEncoder.write(out, max != null ? max : min, min);            // map final [min, null) to [min, min]<a name="line.437"></a>
<span class="sourceLineNo">438</span>            prev = max;<a name="line.438"></a>
<span class="sourceLineNo">439</span>        }<a name="line.439"></a>
<span class="sourceLineNo">440</span>    }<a name="line.440"></a>
<span class="sourceLineNo">441</span><a name="line.441"></a>
<span class="sourceLineNo">442</span>    /**<a name="line.442"></a>
<span class="sourceLineNo">443</span>     * Calculate the number of bytes required to serialize this instance via {@link #serialize serialize()}.<a name="line.443"></a>
<span class="sourceLineNo">444</span>     *<a name="line.444"></a>
<span class="sourceLineNo">445</span>     * @return number of serialized bytes<a name="line.445"></a>
<span class="sourceLineNo">446</span>     */<a name="line.446"></a>
<span class="sourceLineNo">447</span>    public long serializedLength() {<a name="line.447"></a>
<span class="sourceLineNo">448</span>        long total = UnsignedIntEncoder.encodeLength(this.ranges.size());<a name="line.448"></a>
<span class="sourceLineNo">449</span>        byte[] prev = null;<a name="line.449"></a>
<span class="sourceLineNo">450</span>        for (KeyRange range : this.ranges) {<a name="line.450"></a>
<span class="sourceLineNo">451</span>            final byte[] min = range.getMin();<a name="line.451"></a>
<span class="sourceLineNo">452</span>            final byte[] max = range.getMax();<a name="line.452"></a>
<span class="sourceLineNo">453</span>            total += KeyListEncoder.writeLength(min, prev);<a name="line.453"></a>
<span class="sourceLineNo">454</span>            total += KeyListEncoder.writeLength(max != null ? max : min, min);<a name="line.454"></a>
<span class="sourceLineNo">455</span>            prev = max;<a name="line.455"></a>
<span class="sourceLineNo">456</span>        }<a name="line.456"></a>
<span class="sourceLineNo">457</span>        return total;<a name="line.457"></a>
<span class="sourceLineNo">458</span>    }<a name="line.458"></a>
<span class="sourceLineNo">459</span><a name="line.459"></a>
<span class="sourceLineNo">460</span>    /**<a name="line.460"></a>
<span class="sourceLineNo">461</span>     * Deserialize an instance created by {@link #serialize serialize()}.<a name="line.461"></a>
<span class="sourceLineNo">462</span>     *<a name="line.462"></a>
<span class="sourceLineNo">463</span>     * @param input input stream containing data from {@link #serialize serialize()}<a name="line.463"></a>
<span class="sourceLineNo">464</span>     * @return deserialized instance<a name="line.464"></a>
<span class="sourceLineNo">465</span>     * @throws IOException if an I/O error occurs<a name="line.465"></a>
<span class="sourceLineNo">466</span>     * @throws java.io.EOFException if the input ends unexpectedly<a name="line.466"></a>
<span class="sourceLineNo">467</span>     * @throws IllegalArgumentException if {@code input} is null<a name="line.467"></a>
<span class="sourceLineNo">468</span>     */<a name="line.468"></a>
<span class="sourceLineNo">469</span>    public static KeyRanges deserialize(InputStream input) throws IOException {<a name="line.469"></a>
<span class="sourceLineNo">470</span>        if (input == null)<a name="line.470"></a>
<span class="sourceLineNo">471</span>            throw new IllegalArgumentException("null input");<a name="line.471"></a>
<span class="sourceLineNo">472</span>        final int count = UnsignedIntEncoder.read(input);<a name="line.472"></a>
<span class="sourceLineNo">473</span>        final ArrayList&lt;KeyRange&gt; rangeList = new ArrayList&lt;&gt;(count);<a name="line.473"></a>
<span class="sourceLineNo">474</span>        byte[] prev = null;<a name="line.474"></a>
<span class="sourceLineNo">475</span>        for (int i = 0; i &lt; count; i++) {<a name="line.475"></a>
<span class="sourceLineNo">476</span>            final byte[] min = KeyListEncoder.read(input, prev);<a name="line.476"></a>
<span class="sourceLineNo">477</span>            final byte[] max = KeyListEncoder.read(input, min);<a name="line.477"></a>
<span class="sourceLineNo">478</span>            rangeList.add(new KeyRange(min, Arrays.equals(min, max) ? null : max));<a name="line.478"></a>
<span class="sourceLineNo">479</span>            prev = max;<a name="line.479"></a>
<span class="sourceLineNo">480</span>        }<a name="line.480"></a>
<span class="sourceLineNo">481</span>        return new KeyRanges(rangeList);<a name="line.481"></a>
<span class="sourceLineNo">482</span>    }<a name="line.482"></a>
<span class="sourceLineNo">483</span><a name="line.483"></a>
<span class="sourceLineNo">484</span>    /**<a name="line.484"></a>
<span class="sourceLineNo">485</span>     * Deserialize an instance created by {@link #serialize serialize()} in the form of an<a name="line.485"></a>
<span class="sourceLineNo">486</span>     * iterator of the individual {@link KeyRange}s.<a name="line.486"></a>
<span class="sourceLineNo">487</span>     *<a name="line.487"></a>
<span class="sourceLineNo">488</span>     * &lt;p&gt;<a name="line.488"></a>
<span class="sourceLineNo">489</span>     * If an {@link IOException} is thrown while reading, the returned {@link Iterator}<a name="line.489"></a>
<span class="sourceLineNo">490</span>     * will throw a {@link RuntimeException} wrapping it. If invalid data is encountered,<a name="line.490"></a>
<span class="sourceLineNo">491</span>     * the returned {@link Iterator} will throw an {@link IllegalArgumentException}.<a name="line.491"></a>
<span class="sourceLineNo">492</span>     *<a name="line.492"></a>
<span class="sourceLineNo">493</span>     * @param input input stream containing data from {@link #serialize serialize()}<a name="line.493"></a>
<span class="sourceLineNo">494</span>     * @return deserialized iteration of {@link KeyRange}s<a name="line.494"></a>
<span class="sourceLineNo">495</span>     * @throws IllegalArgumentException if {@code input} is null<a name="line.495"></a>
<span class="sourceLineNo">496</span>     */<a name="line.496"></a>
<span class="sourceLineNo">497</span>    public static Iterator&lt;KeyRange&gt; deserializeIterator(final InputStream input) {<a name="line.497"></a>
<span class="sourceLineNo">498</span>        Preconditions.checkArgument(input != null, "null input");<a name="line.498"></a>
<span class="sourceLineNo">499</span>        return new UnmodifiableIterator&lt;KeyRange&gt;() {<a name="line.499"></a>
<span class="sourceLineNo">500</span><a name="line.500"></a>
<span class="sourceLineNo">501</span>            private int remain = -1;<a name="line.501"></a>
<span class="sourceLineNo">502</span>            private byte[] prev;<a name="line.502"></a>
<span class="sourceLineNo">503</span><a name="line.503"></a>
<span class="sourceLineNo">504</span>            @Override<a name="line.504"></a>
<span class="sourceLineNo">505</span>            public boolean hasNext() {<a name="line.505"></a>
<span class="sourceLineNo">506</span>                try {<a name="line.506"></a>
<span class="sourceLineNo">507</span>                    this.init();<a name="line.507"></a>
<span class="sourceLineNo">508</span>                } catch (IOException e) {<a name="line.508"></a>
<span class="sourceLineNo">509</span>                    throw new RuntimeException(e);<a name="line.509"></a>
<span class="sourceLineNo">510</span>                }<a name="line.510"></a>
<span class="sourceLineNo">511</span>                return this.remain &gt; 0;<a name="line.511"></a>
<span class="sourceLineNo">512</span>            }<a name="line.512"></a>
<span class="sourceLineNo">513</span><a name="line.513"></a>
<span class="sourceLineNo">514</span>            @Override<a name="line.514"></a>
<span class="sourceLineNo">515</span>            public KeyRange next() {<a name="line.515"></a>
<span class="sourceLineNo">516</span>                if (this.remain == 0)<a name="line.516"></a>
<span class="sourceLineNo">517</span>                    throw new NoSuchElementException();<a name="line.517"></a>
<span class="sourceLineNo">518</span>                final byte[] min;<a name="line.518"></a>
<span class="sourceLineNo">519</span>                final byte[] max;<a name="line.519"></a>
<span class="sourceLineNo">520</span>                try {<a name="line.520"></a>
<span class="sourceLineNo">521</span>                    this.init();<a name="line.521"></a>
<span class="sourceLineNo">522</span>                    min = KeyListEncoder.read(input, this.prev);<a name="line.522"></a>
<span class="sourceLineNo">523</span>                    max = KeyListEncoder.read(input, min);<a name="line.523"></a>
<span class="sourceLineNo">524</span>                } catch (IOException e) {<a name="line.524"></a>
<span class="sourceLineNo">525</span>                    throw new RuntimeException(e);<a name="line.525"></a>
<span class="sourceLineNo">526</span>                }<a name="line.526"></a>
<span class="sourceLineNo">527</span>                final KeyRange range = new KeyRange(min, Arrays.equals(min, max) ? null : max);<a name="line.527"></a>
<span class="sourceLineNo">528</span>                this.prev = max;<a name="line.528"></a>
<span class="sourceLineNo">529</span>                this.remain--;<a name="line.529"></a>
<span class="sourceLineNo">530</span>                return range;<a name="line.530"></a>
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<span class="sourceLineNo">532</span><a name="line.532"></a>
<span class="sourceLineNo">533</span>            private void init() throws IOException {<a name="line.533"></a>
<span class="sourceLineNo">534</span>                if (this.remain == -1)<a name="line.534"></a>
<span class="sourceLineNo">535</span>                    this.remain = UnsignedIntEncoder.read(input);<a name="line.535"></a>
<span class="sourceLineNo">536</span>            }<a name="line.536"></a>
<span class="sourceLineNo">537</span>        };<a name="line.537"></a>
<span class="sourceLineNo">538</span>    }<a name="line.538"></a>
<span class="sourceLineNo">539</span><a name="line.539"></a>
<span class="sourceLineNo">540</span>// KeyFilter<a name="line.540"></a>
<span class="sourceLineNo">541</span><a name="line.541"></a>
<span class="sourceLineNo">542</span>    @Override<a name="line.542"></a>
<span class="sourceLineNo">543</span>    public boolean contains(byte[] key) {<a name="line.543"></a>
<span class="sourceLineNo">544</span>        final KeyRange[] pair = this.findKey(key);<a name="line.544"></a>
<span class="sourceLineNo">545</span>        return pair[0] == pair[1] &amp;&amp; pair[0] != null;<a name="line.545"></a>
<span class="sourceLineNo">546</span>    }<a name="line.546"></a>
<span class="sourceLineNo">547</span><a name="line.547"></a>
<span class="sourceLineNo">548</span>    @Override<a name="line.548"></a>
<span class="sourceLineNo">549</span>    public byte[] seekHigher(byte[] key) {<a name="line.549"></a>
<span class="sourceLineNo">550</span>        final KeyRange[] pair = this.findKey(key);<a name="line.550"></a>
<span class="sourceLineNo">551</span>        if (pair[0] == pair[1])<a name="line.551"></a>
<span class="sourceLineNo">552</span>            return pair[0] != null ? key : null;<a name="line.552"></a>
<span class="sourceLineNo">553</span>        return pair[1] != null ? pair[1].getMin() : null;<a name="line.553"></a>
<span class="sourceLineNo">554</span>    }<a name="line.554"></a>
<span class="sourceLineNo">555</span><a name="line.555"></a>
<span class="sourceLineNo">556</span>    @Override<a name="line.556"></a>
<span class="sourceLineNo">557</span>    public byte[] seekLower(byte[] key) {<a name="line.557"></a>
<span class="sourceLineNo">558</span>        if (key == null)<a name="line.558"></a>
<span class="sourceLineNo">559</span>            throw new IllegalArgumentException("null key");<a name="line.559"></a>
<span class="sourceLineNo">560</span>        if (key.length == 0) {<a name="line.560"></a>
<span class="sourceLineNo">561</span>            if (this.ranges.isEmpty())<a name="line.561"></a>
<span class="sourceLineNo">562</span>                return null;<a name="line.562"></a>
<span class="sourceLineNo">563</span>            final byte[] lastMax = this.ranges.get(this.ranges.size() - 1).getMax();<a name="line.563"></a>
<span class="sourceLineNo">564</span>            return lastMax != null ? lastMax : ByteUtil.EMPTY;<a name="line.564"></a>
<span class="sourceLineNo">565</span>        }<a name="line.565"></a>
<span class="sourceLineNo">566</span>        final KeyRange[] pair = this.findKey(key);<a name="line.566"></a>
<span class="sourceLineNo">567</span>        if (pair[0] == pair[1])<a name="line.567"></a>
<span class="sourceLineNo">568</span>            return pair[0] != null ? key : null;<a name="line.568"></a>
<span class="sourceLineNo">569</span>        return pair[0] != null ? pair[0].getMax() : null;<a name="line.569"></a>
<span class="sourceLineNo">570</span>    }<a name="line.570"></a>
<span class="sourceLineNo">571</span><a name="line.571"></a>
<span class="sourceLineNo">572</span>// Object<a name="line.572"></a>
<span class="sourceLineNo">573</span><a name="line.573"></a>
<span class="sourceLineNo">574</span>    @Override<a name="line.574"></a>
<span class="sourceLineNo">575</span>    public boolean equals(Object obj) {<a name="line.575"></a>
<span class="sourceLineNo">576</span>        if (obj == this)<a name="line.576"></a>
<span class="sourceLineNo">577</span>            return true;<a name="line.577"></a>
<span class="sourceLineNo">578</span>        if (obj == null || obj.getClass() != this.getClass())<a name="line.578"></a>
<span class="sourceLineNo">579</span>            return false;<a name="line.579"></a>
<span class="sourceLineNo">580</span>        final KeyRanges that = (KeyRanges)obj;<a name="line.580"></a>
<span class="sourceLineNo">581</span>        return this.ranges.equals(that.ranges);<a name="line.581"></a>
<span class="sourceLineNo">582</span>    }<a name="line.582"></a>
<span class="sourceLineNo">583</span><a name="line.583"></a>
<span class="sourceLineNo">584</span>    @Override<a name="line.584"></a>
<span class="sourceLineNo">585</span>    public int hashCode() {<a name="line.585"></a>
<span class="sourceLineNo">586</span>        return this.ranges.hashCode();<a name="line.586"></a>
<span class="sourceLineNo">587</span>    }<a name="line.587"></a>
<span class="sourceLineNo">588</span><a name="line.588"></a>
<span class="sourceLineNo">589</span>    @Override<a name="line.589"></a>
<span class="sourceLineNo">590</span>    public String toString() {<a name="line.590"></a>
<span class="sourceLineNo">591</span>        final StringBuilder buf = new StringBuilder();<a name="line.591"></a>
<span class="sourceLineNo">592</span>        buf.append(this.getClass().getSimpleName()).append("[");<a name="line.592"></a>
<span class="sourceLineNo">593</span>        boolean first = true;<a name="line.593"></a>
<span class="sourceLineNo">594</span>        for (KeyRange range : this.ranges) {<a name="line.594"></a>
<span class="sourceLineNo">595</span>            if (first)<a name="line.595"></a>
<span class="sourceLineNo">596</span>                first = false;<a name="line.596"></a>
<span class="sourceLineNo">597</span>            else<a name="line.597"></a>
<span class="sourceLineNo">598</span>                buf.append(",");<a name="line.598"></a>
<span class="sourceLineNo">599</span>            buf.append(range);<a name="line.599"></a>
<span class="sourceLineNo">600</span>        }<a name="line.600"></a>
<span class="sourceLineNo">601</span>        buf.append("]");<a name="line.601"></a>
<span class="sourceLineNo">602</span>        return buf.toString();<a name="line.602"></a>
<span class="sourceLineNo">603</span>    }<a name="line.603"></a>
<span class="sourceLineNo">604</span><a name="line.604"></a>
<span class="sourceLineNo">605</span>// Internal methods<a name="line.605"></a>
<span class="sourceLineNo">606</span><a name="line.606"></a>
<span class="sourceLineNo">607</span>    // Return a "minimal" list with these properties:<a name="line.607"></a>
<span class="sourceLineNo">608</span>    //  - Sorted according to KeyRange.SORT_BY_MIN<a name="line.608"></a>
<span class="sourceLineNo">609</span>    //  - No overlapping ranges<a name="line.609"></a>
<span class="sourceLineNo">610</span>    //  - Adjacent ranges consolidated into a single range<a name="line.610"></a>
<span class="sourceLineNo">611</span>    private static ArrayList&lt;KeyRange&gt; minimize(List&lt;KeyRange&gt; ranges) {<a name="line.611"></a>
<span class="sourceLineNo">612</span><a name="line.612"></a>
<span class="sourceLineNo">613</span>        // Create array<a name="line.613"></a>
<span class="sourceLineNo">614</span>        final ArrayList&lt;KeyRange&gt; sortedRanges = new ArrayList&lt;&gt;(ranges);<a name="line.614"></a>
<span class="sourceLineNo">615</span><a name="line.615"></a>
<span class="sourceLineNo">616</span>        // Remove empty ranges<a name="line.616"></a>
<span class="sourceLineNo">617</span>        for (Iterator&lt;KeyRange&gt; i = sortedRanges.iterator(); i.hasNext(); ) {<a name="line.617"></a>
<span class="sourceLineNo">618</span>            if (i.next().isEmpty())<a name="line.618"></a>
<span class="sourceLineNo">619</span>                i.remove();<a name="line.619"></a>
<span class="sourceLineNo">620</span>        }<a name="line.620"></a>
<span class="sourceLineNo">621</span><a name="line.621"></a>
<span class="sourceLineNo">622</span>        // Sort remaining ranges by min, then max<a name="line.622"></a>
<span class="sourceLineNo">623</span>        Collections.sort(sortedRanges, KeyRange.SORT_BY_MIN);<a name="line.623"></a>
<span class="sourceLineNo">624</span><a name="line.624"></a>
<span class="sourceLineNo">625</span>        // Consolidate<a name="line.625"></a>
<span class="sourceLineNo">626</span>        final ArrayList&lt;KeyRange&gt; list = new ArrayList&lt;&gt;(ranges.size());<a name="line.626"></a>
<span class="sourceLineNo">627</span>        KeyRange prev = null;<a name="line.627"></a>
<span class="sourceLineNo">628</span>        for (KeyRange range : sortedRanges) {<a name="line.628"></a>
<span class="sourceLineNo">629</span><a name="line.629"></a>
<span class="sourceLineNo">630</span>            // Sanity check range<a name="line.630"></a>
<span class="sourceLineNo">631</span>            if (range == null)<a name="line.631"></a>
<span class="sourceLineNo">632</span>                throw new IllegalArgumentException("null range");<a name="line.632"></a>
<span class="sourceLineNo">633</span><a name="line.633"></a>
<span class="sourceLineNo">634</span>            // Handle first in list<a name="line.634"></a>
<span class="sourceLineNo">635</span>            if (prev == null) {<a name="line.635"></a>
<span class="sourceLineNo">636</span>                prev = range;<a name="line.636"></a>
<span class="sourceLineNo">637</span>                continue;<a name="line.637"></a>
<span class="sourceLineNo">638</span>            }<a name="line.638"></a>
<span class="sourceLineNo">639</span><a name="line.639"></a>
<span class="sourceLineNo">640</span>            // Compare to previous range<a name="line.640"></a>
<span class="sourceLineNo">641</span>            final int diff1 = KeyRange.compare(range.getMin(), prev.getMin());<a name="line.641"></a>
<span class="sourceLineNo">642</span>            assert diff1 &gt;= 0;<a name="line.642"></a>
<span class="sourceLineNo">643</span>            if (diff1 == 0) {                           // range contains prev -&gt; discard prev<a name="line.643"></a>
<span class="sourceLineNo">644</span>                assert range.contains(prev);<a name="line.644"></a>
<span class="sourceLineNo">645</span>                prev = range;<a name="line.645"></a>
<span class="sourceLineNo">646</span>                continue;<a name="line.646"></a>
<span class="sourceLineNo">647</span>            }<a name="line.647"></a>
<span class="sourceLineNo">648</span>            final int diff2 = KeyRange.compare(range.getMin(), prev.getMax());<a name="line.648"></a>
<span class="sourceLineNo">649</span>            if (diff2 &lt;= 0) {                           // prev and range overlap -&gt; take their union<a name="line.649"></a>
<span class="sourceLineNo">650</span>                final byte[] max = KeyRange.compare(range.getMax(), prev.getMax()) &gt; 0 ? range.getMax() : prev.getMax();<a name="line.650"></a>
<span class="sourceLineNo">651</span>                prev = new KeyRange(prev.getMin(), max);<a name="line.651"></a>
<span class="sourceLineNo">652</span>                continue;<a name="line.652"></a>
<span class="sourceLineNo">653</span>            }<a name="line.653"></a>
<span class="sourceLineNo">654</span><a name="line.654"></a>
<span class="sourceLineNo">655</span>            // OK add it<a name="line.655"></a>
<span class="sourceLineNo">656</span>            list.add(prev);                             // prev and range don't overlap -&gt; accept prev<a name="line.656"></a>
<span class="sourceLineNo">657</span>            prev = range;<a name="line.657"></a>
<span class="sourceLineNo">658</span>            continue;<a name="line.658"></a>
<span class="sourceLineNo">659</span>        }<a name="line.659"></a>
<span class="sourceLineNo">660</span>        if (prev != null)<a name="line.660"></a>
<span class="sourceLineNo">661</span>            list.add(prev);<a name="line.661"></a>
<span class="sourceLineNo">662</span>        list.trimToSize();<a name="line.662"></a>
<span class="sourceLineNo">663</span>        return list;<a name="line.663"></a>
<span class="sourceLineNo">664</span>    }<a name="line.664"></a>
<span class="sourceLineNo">665</span>}<a name="line.665"></a>
<span class="sourceLineNo">666</span><a name="line.666"></a>




























































</pre>
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